курсовая работа / engine / shapes

import { rad, Vec } from "../core";

/** @enum {string} */
export const ShapeTypes = {
RECT: "rect",
CIRCLE: "circle",
};

export class Shape {
/** @type {GameObject} */
obj;

/** @param {GameObject} obj */
constructor(obj) {
this.obj = obj;
}

/** @param {Vec} dot
* @returns {boolean}
* @abstract */
inside(dot) {
return false;
}

/** @param {Vec} vec
* @returns {Vec}
* @abstract */
getBorderDot(vec) {
return new Vec();
}
}

export class Circle extends Shape {
/** @override */
inside(dot) {
return this.obj.pos.range(dot) <= this.obj.props.radius;
}

/** @override */
getBorderDot(vec) {
return vec.norm().mult(this.obj.props.radius);
}
}

export class Rect extends Shape {
/** @override */
inside(dot) {
let v = this.obj.pos.diff(dot);
return (
Math.abs(this.obj.rot.proj(v)) <= this.obj.props.width / 2 &&
Math.abs(this.obj.rot.rot(rad(90)).proj(v)) <= this.obj.props.height / 2
);
}

getBorderDot(vec) {
let nvec = vec
.norm()
.mult((this.obj.props.width ** 2 + this.obj.props.height ** 2) ** (1 / 2))
.abs();
return vec
.sign()
.mult(
new Vec(
Math.min(this.obj.rot.proj(nvec), this.obj.props.width / 2),
Math.min(
this.obj.rot.rot(rad(90)).proj(nvec),
this.obj.props.height / 2
)
).rot(this.obj.rot)
);
}
}